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Figure 5.12: CN rotational bands observed in the discharge of the <strong>plasma</strong>.<br />

5.4. Conclusions<br />

Capítulo 5<br />

The air <strong>plasma</strong> used in this study was proven to be effective at <strong>de</strong>composing CCl4<br />

and C2HCl3. The <strong>de</strong>struction efficiency of the <strong>plasma</strong> increased with an increase in<br />

applied microwave power; however, at 300 W, <strong>de</strong>struction percentages of 99.99% were<br />

achieved. An optimum range of flow rates were observed for each diameter of the<br />

coupler tip, and the corresponding gas velocity was ca. 48 m/s. The range of optimal<br />

flow rates and the ability to replace the tip allowed the efficiency of the process to reach<br />

1000 g/kW·h at an operating cost of approximately $0.1/kg of VOCs. Moreover, the<br />

percent <strong>de</strong>struction of the proposed system increased with an increase in the input<br />

concentration of VOCs, which is consistent with previous results.<br />

The <strong>plasma</strong> torch investigated in this study can be used in industrial settings for<br />

the removal of VOCs because it can be operated with an air <strong>plasma</strong> at atmospheric<br />

pressure and the cost of operation is low. Moreover, the range of treatable VOC<br />

concentrations is virtually <strong>un</strong>restricted, which is a significant advantage to the proposed<br />

method.<br />

Intensity (a.u.)<br />

20000<br />

18000<br />

16000<br />

14000<br />

12000<br />

10000<br />

8000<br />

6000<br />

4000<br />

2000<br />

CN Rotational Bands<br />

Air <strong>plasma</strong><br />

Flow rate: 1.5 L/min<br />

MW power: 600 W<br />

1000 ppmv C 2 HCl 3<br />

0<br />

384 385 386 387 388 389<br />

Wavelength (nm)<br />

139

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